Separation strategy for amphoteric molecules. If the molecule is stable at a pH above its pl, an anion exchange support is used. If the molecule is stable at a pH below its pl, a cation exchange support is used.

Bio-Rex 5 resins are weak anion exchangers that contain primarily tertiary but also some quaternary amines on a styrenedivinylbenzene lattice. Bio-Rex 5 resins exchange anions such as iodide, bromide, and chloride with weak interactions, allowing easy elution and regeneration. Bio-Rex 5 resins have an affinity for organic acids that can be used to remove acids from sugars.

Bio-Rex 5 resins are available in two dry mesh sizes (100–200 and 200–400) and are all analytical grade purity. They have been exhaustively sized, purified, and converted to make them suitable for accurate, reproducible analytical techniques.

Larger volumes and special packaging for industrial applications are available on request.

Type

Weak anion

Functional group

R-N+(CH3)2C2H4OH

Matrix

Styrene divinylbenzene

Crosslinkage

4%

Approx. MW exclusion

1,400

Operating stability/pH range

<7/0–14

Min. wet capacity (meq/ml)

1.1

Nominal density

0.7

Ionic form

Chloride

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For more than 15 years, Bio-Rad has made science education a major priority. To support this effort, the company has implemented a discount policy that allows high school and college teaching laboratories to purchase kits, instruments, reagents, and other equipment at preferred prices.

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